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Hi nomar_11,
You might be experiencing a display issue or you just accidentally adjust some setting on your computer. There's an easy way for you to solve this concern. Please try these steps to bring back the good known configuration of your computer.

Step 1. Turn off the computer completely.

Step 2. Remove the battery from the system and disconnect the AC adapter/charger.

Step 3. Now press and hold down the power button for 15-20 seconds.

Step 4. Put back the battery in and please make sure that you connected the AC adapter.

First: Make sure after you connected the external monitor to press a combination of key( Fn +[1-9: check for a small picture of LCD monitor] ). If after this no image is displayed on the external monitor then you may need to replace your motherboard. Some local computer shops may be able to fix it. The reason you are having this problem is because the video card is dead.

This is your back light on your lcd display, To prove that have a flash light handy when it goes dark point the flash light at the screen and you should see the screen and that would mean right there you got a back light going out or the inverter that powers it is going bad. Etherway if this is not your area of work you need to tech it to a computer tech local to have it repaired.

Hello wall flower hi, when you turn on the laptop, did you see the start up screen clearly? can you read words on the screen, and then it goes dark? If this is the case, check first the Fn key with the corresponding display for projector, (usually Fn+F5) this combination key is used to display the content of your computer to the LCD or Projector, IF not such a case, it may be problems with your laptop inverter board that powers the backlight.
Check your bios settings also.

I got two suggestions for ya. First, check to see if the lid switch that tells the screen the lid is open is stuck closed. If it's not, chances are your backlight is bad and unfortunately you would have to replace your lcd screen.

Click on start -->control panel-->power options and then check the option that says choose what closing the lid does. You have to change this setting to 'do nothing' if you want the computer to stay on when you close the lid.

How long have you had your computer? Mine has been doing this. The battery has died out over time, and now I think the adapter is too. It's kind of kinked near where it plugs into the computer (probably from the weight of the chord constantly being pulled down). It just gets a bad connection, a little less power, and goes dim like that. If I readjust the connection and turn off/turn back on the computer, it usually comes on bright again. But I ordered a new battery

It sounds like your graphics card is shot. If your graphics card is a dedicated graphics card, you might be able to get it fixed/replaced; if it is embedded, then you are probably going to have to buy a whole new display screen.